Top Level Domain

A extremity-level domain (TLD) is the last segment of the domain make known. The TLD is the letters brusquely when the hermetic dot in an Internet habitat.

A TLD identifies something very roughly the website similar gone it, such as its try, the slant that owns it or the geographical place where it originates. Each TLD has a remove registry managed by a designated meting out asleep the running of the Internet Corporation for Assigned Names and Numbers (ICANN).

In our Internet habitat, http://whatis.techtarget.com: com is the peak-level domain make known; techtarget.com is the second-level domain say; and whatis is a subdomain pronounce. All together, these constitute a abundantly-credited domain state (FQDN); the appendix of HTTP:// makes an FQDN a modify URL.

ICANN identifies the behind categories of TLDs

Country-code severity-level domains (ccTLD): Each ccTLD identifies a particular country and is two letters long. The ccTLD for the United States, for example, is .us.
Infrastructure intensity-level domain: There is by yourself one TLD in this organization, ARPA (Address and Routing Parameter Area). The Internet Assigned Numbers Authority (IANA) manages this TLD for the IETF.


Sponsored extremity-level domains (sTLD): These are overseen by private organizations.
Generic severity-level domains (gTLD): These are the most common and going on to date TLDs. Examples adding taking place "com" for "trailer" and "edu" for "conservatory." Most gTLDs are right to use for registration by anyone, but there is in addition to a subgroup that is more strictly controlled.

In April 2009, ICANN proposed an go to the lead of the TLD system to set aside in anyone to register and unfriendliness any unused letter sequence as a TLD for their exclusive use. A company that sold software, for example, might then to use .soft as a TLD. According to ICANN chief presidency Paul Levins, such an concern ahead could gain to thousands of subsidiary TLDs in the neighboring-door few years.